US8649317B2 - Wireless communication relay station apparatus, wireless communication apparatus, wireless communication relay method, and wireless communication method - Google Patents

Wireless communication relay station apparatus, wireless communication apparatus, wireless communication relay method, and wireless communication method Download PDF

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US8649317B2
US8649317B2 US13/376,653 US201013376653A US8649317B2 US 8649317 B2 US8649317 B2 US 8649317B2 US 201013376653 A US201013376653 A US 201013376653A US 8649317 B2 US8649317 B2 US 8649317B2
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wireless communication
subframe
signal
relay station
frequency band
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US20120082085A1 (en
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Ayako Horiuchi
Yasuaki Yuda
Seigo Nakao
Daichi Imamura
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Panasonic Intellectual Property Corp of America
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Panasonic Corp
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15564—Relay station antennae loop interference reduction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
    • H04B7/15542—Selecting at relay station its transmit and receive resources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H04B7/2606—Arrangements for base station coverage control, e.g. by using relays in tunnels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/042—Public Land Mobile systems, e.g. cellular systems
    • H04W84/047—Public Land Mobile systems, e.g. cellular systems using dedicated repeater stations

Definitions

  • the present invention relates to a wireless communication relay station apparatus, a wireless communication apparatus, a wireless communication relay method and a wireless communication method, and in particular relates to a wireless communication relay station apparatus, a wireless communication apparatus, a wireless communication relay method and a wireless communication method for transmission/reception of data to/from another wireless communication apparatus via the wireless communication relay station apparatus.
  • a high frequency wireless bandwidth when a high frequency wireless bandwidth is utilized, a high transmission rate can be expected at a short distance but attenuation is increased in accordance with a transmission distance as the distance is increased.
  • a coverage area of a wireless communication base station apparatus hereinafter abbreviated as a “base station” is reduced, and therefore, there arises the necessity for installation of a larger number of base stations. Since the cost of installation of base stations is correspondingly high, there is a strong demand for a technique for realizing communication service that utilizes a high frequency wireless bandwidth while suppressing an increase in the number of base stations.
  • FIG. 10 is a schematic diagram illustrating an overall configuration of a conventional wireless relay system.
  • a terminal mobile station 20
  • a relay station 30 a terminal subordinate to the base station 10 .
  • FIG. 11 is a conceptual diagram of the relay system in which the TDD system is used for relaying of the relay station 30 .
  • the base station 10 the relay station 30 , the mobile station 21 and the mobile station 20 will be simply referred to as “eNB”, “RN”, “UE 1 ” and “UE 2 ”, respectively.
  • a signal is transmitted via an uplink (UL) in the direction indicated by the arrow from any one of UE 1 , LTE-A UE 2 and RN, which plays a predominant role in the corresponding operation (left end of FIG. 11 ), by using any one of subframes # 2 to # 5 serving as the corresponding subframe (upper row in FIG. 11 ).
  • RN uses part of resources allocated to UL and part of resources allocated to DL to transmit/receive data to/from eNB, and during this period, RN suspends service provided to UE 2 connected to RN.
  • FIG. 11 illustrates an example in which the subframes # 2 and # 3 are UL subframes serving as subframes for the uplink, and subframes # 4 and # 5 are subframes for the downlink.
  • the subframes # 3 and # 4 are used to perform communication between RN and eNB through UL and DL, respectively.
  • carrier aggregation in which a base station simultaneously provides service of two or more frequency bands (carriers).
  • carrier aggregation when attention is given to a single frequency band, a system is established just by the single frequency band, and therefore, selection is allowed between the use of only a single carrier and the use of a plurality of carriers in accordance with configurations of UE 1 and UE 2 and requests therefrom.
  • UL and DL configurations are preferably coordinated with each other in order to prevent loop interference.
  • the configurations are not coordinated with each other, there occurs a problem that transmission and reception differ between the carriers and a signal of a transmission antenna causes loop interference in a reception antenna.
  • FIG. 12 is a diagram for describing an example in which loop interference occurs in a TDD system that performs carrier aggregation.
  • carrier aggregation is performed using the following two frequency bands: a frequency band 1 (Carrier 1 in FIG. 12 ) and a frequency band 2 (Carrier 2 in FIG. 12 ).
  • a base station 10 a base station 10 , a relay station 30 , a mobile station 21 and a mobile station 20 will be simply referred to as “eNB”, “RN”, “UE 1 ” and “UE 2 ”, respectively.
  • RN when subframes are partially used for communication between eNB and RN in the frequency band 1 , and service is provided to UE 2 by RN in the frequency band 2 , transmission and reception of signals of the frequency band 1 and signals of the frequency band 2 are opposite to each other, thereby causing loop interference in RN. That is to say, in the frequency band 1 , RN transmits UL data using a subframe # 3 , and receives DL data using a subframe # 4 .
  • RN receives UL data using the subframe # 3 , and transmits DL data using the subframe # 4 .
  • RN transmits data in the frequency band 1 and receives data in the frequency band 2 , thus causing loop interference.
  • RN receives data in the frequency band 1 and transmits data in the frequency band 2 , thus causing loop interference.
  • An object of the present invention is to provide a wireless communication relay station apparatus, a wireless communication apparatus, a wireless communication relay method and a wireless communication method which are capable of effectively utilizing resources and preventing loop interference.
  • the present invention provides a wireless communication relay station apparatus for relaying communication between a first wireless communication apparatus and a second wireless communication apparatus in at least two or more frequency bands
  • the wireless communication relay station apparatus including: a transmitter which is configured, in a first subframe, to transmit a first uplink signal to the first wireless communication apparatus in a first frequency band, and to transmit a first downlink signal to the second wireless communication apparatus in a second frequency band; and a receiver which is configured, in a second subframe, to receive a second downlink signal from the first wireless communication apparatus in the first frequency band, and to receive a second uplink signal from the second wireless communication apparatus in the second frequency band.
  • the first subframe is a subframe configured for an uplink through which a communication between the wireless communication relay station apparatus and the second wireless communication apparatus is performed
  • the second subframe is a subframe configured for a downlink through which a communication between the wireless communication relay station apparatus and the second wireless communication apparatus is performed.
  • the wireless communication relay station apparatus further includes a timing setter which is configured to set a transmission timing for the first uplink signal in the first subframe in accordance with a transmission delay amount between the wireless communication relay station apparatus and the first wireless communication apparatus, and the transmitter is configured, at the set transmission timing, to transmit the first uplink signal to the first wireless communication apparatus in the first frequency band, and to transmit the first downlink signal to the second wireless communication apparatus in the second frequency band.
  • a timing setter which is configured to set a transmission timing for the first uplink signal in the first subframe in accordance with a transmission delay amount between the wireless communication relay station apparatus and the first wireless communication apparatus, and the transmitter is configured, at the set transmission timing, to transmit the first uplink signal to the first wireless communication apparatus in the first frequency band, and to transmit the first downlink signal to the second wireless communication apparatus in the second frequency band.
  • the timing setter is configured to set the transmission timing so as to increase a symbol number in accordance with increase in the transmission delay amount between the wireless communication relay station apparatus and the first wireless communication apparatus, the symbol number indicating a number at which the transmission to the first wireless communication apparatus in the first subframe is started.
  • the wireless communication relay station apparatus further includes a control information generator which is configured generate transmission timing control information indicative of the set transmission timing of the first uplink signal in the first subframe, by the timing setter, and the transmitter is configured to transmit the generated transmission timing control information to the second wireless communication apparatus.
  • a control information generator which is configured generate transmission timing control information indicative of the set transmission timing of the first uplink signal in the first subframe, by the timing setter, and the transmitter is configured to transmit the generated transmission timing control information to the second wireless communication apparatus.
  • the wireless communication relay station apparatus further includes a timing setter which is configured to set a reception timing for the second downlink signal in the second subframe in accordance with a transmission delay amount between the wireless communication relay station apparatus and the first wireless communication apparatus, and the receiver is configured, at the set reception timing, to receive the second downlink signal from the first wireless communication apparatus in the first frequency band, and to receive the second uplink signal from the second wireless communication apparatus in the second frequency band.
  • a timing setter which is configured to set a reception timing for the second downlink signal in the second subframe in accordance with a transmission delay amount between the wireless communication relay station apparatus and the first wireless communication apparatus, and the receiver is configured, at the set reception timing, to receive the second downlink signal from the first wireless communication apparatus in the first frequency band, and to receive the second uplink signal from the second wireless communication apparatus in the second frequency band.
  • the wireless communication relay station apparatus further includes a control information generator which is configured to generate reception timing control information indicative of the set reception timing of the second downlink signal in the second subframe, by the timing setter, and the transmitter is configured to transmit the generated reception timing control information to the second wireless communication apparatus.
  • a control information generator which is configured to generate reception timing control information indicative of the set reception timing of the second downlink signal in the second subframe, by the timing setter, and the transmitter is configured to transmit the generated reception timing control information to the second wireless communication apparatus.
  • the receiver is configured to receive a response signal from the second wireless communication apparatus in the second subframe, the response signal indicating a signal responsive to downlink signals transmitted in the first frequency band and the second frequency band using a third subframe preceding the second subframe by four or more symbols.
  • the transmitter is configured to transmit a response signal to the second wireless communication apparatus in the first subframe, the response signal indicating a signal responsive to uplink signals received in the first frequency band and the second frequency band using a fourth subframe preceding the first subframe by four or more symbols.
  • the present invention also provides a wireless communication apparatus for communicating with another wireless communication apparatus via a wireless communication relay station apparatus in at least two or more frequency bands, the wireless communication apparatus including: a receiver which is configured, in a first subframe configured for an uplink through which a communication between the wireless communication relay station apparatus and the wireless communication apparatus is performed, to receive a first downlink signal relayed from the wireless communication relay station apparatus in a predetermined frequency band, and in a second subframe configured for a downlink through which a communication between the wireless communication relay station apparatus and the wireless communication apparatus is performed, to receive an allocation signal for transmission of a second uplink signal to the wireless communication relay station apparatus; and a transmitter which is configured to transmit the second uplink signal to the wireless communication relay station apparatus in the second subframe in accordance with the allocation signal.
  • the receiver is configured to receive the first downlink signal from the wireless communication relay station apparatus in the first subframe in accordance with transmission timing control information indicative of a transmission timing of the first downlink signal from the wireless communication relay station apparatus, the transmission timing being set in accordance with a transmission delay amount between the wireless communication relay station apparatus and the another wireless communication apparatus and being coordinated with a transmission timing of a first uplink signal from the wireless communication relay station apparatus to the another wireless communication apparatus in the first subframe.
  • the receiver is configured to receives reception timing control information indicative of reception timing of the second uplink signal for the wireless communication relay station apparatus, the reception timing being set in accordance with a transmission delay amount between the wireless communication relay station apparatus and the another wireless communication apparatus and being coordinated with a reception timing of a second downlink signal from the another wireless communication apparatus to the wireless communication relay station apparatus in the second subframe, and the transmitter is configured to transmit the uplink signal to the wireless communication relay station apparatus in the second subframe in accordance with the reception timing control information.
  • the transmitter is configured to transmit a response signal to the wireless communication relay station apparatus in the second subframe, the response signal indicating a signal responsive to downlink signals received in the predetermined frequency band and another frequency band different from the predetermined frequency band using a third subframe preceding the second subframe by four or more symbols.
  • the receiver is configured to receive a response signal from the wireless communication relay station apparatus in the first subframe, the response signal indicating a signal responsive to uplink signals transmitted in the predetermined frequency band and another frequency band different from the predetermined frequency band using a fourth subframe preceding the first subframe by four or more symbols.
  • the present invention also provides a wireless communication relay method in a wireless communication relay station apparatus for relaying communication between a first wireless communication apparatus and a second wireless communication apparatus in at least two or more frequency bands, the wireless communication relay method including: in a first subframe, transmitting a first uplink signal to the first wireless communication apparatus in a first frequency band, and transmitting a first downlink signal to the second wireless communication apparatus in a second frequency band; and in a second subframe, receiving a second downlink signal from the first wireless communication apparatus in the first frequency band, and receiving a second uplink signal from the second wireless communication apparatus in the second frequency band.
  • the present invention also provides a wireless communication method in a wireless communication apparatus for communicating with another wireless communication apparatus via a wireless communication relay station apparatus in at least two or more frequency bands, the wireless communication method including: in a first subframe configured for an uplink through which a communication between the wireless communication relay station apparatus and the wireless communication apparatus is performed, receiving a first downlink signal relayed from the wireless communication relay station apparatus in a predetermined frequency band, and in a second subframe configured for a downlink through which a communication between the wireless communication relay station apparatus and the wireless communication apparatus is performed, receiving an allocation signal for transmission of a second uplink signal to the wireless communication relay station apparatus; and transmitting the second uplink signal to the wireless communication relay station apparatus in the second subframe in accordance with the allocation signal.
  • a wireless communication relay station apparatus, a wireless communication apparatus, a wireless communication relay method and a wireless communication method according to the present invention are capable of effectively utilizing resources and preventing loop interference.
  • FIG. 1 is a schematic diagram illustrating a configuration of a wireless relay system according to Embodiment 1.
  • FIG. 2 is a diagram for describing an operation example of the wireless relay system according to Embodiment 1.
  • FIG. 3 is a diagram illustrating timings at which data is transmitted/received using subframes # 3 and # 4 in the wireless relay system according to Embodiment 1.
  • FIG. 4 is a flow chart illustrating an example in which UL is allocated to LTE-A UE 2 from RN and LTE-A UE 2 changes transmission timing.
  • FIG. 5 is a block diagram illustrating a configuration of a reception side of eNB according to Embodiment 1.
  • FIG. 6 is a block diagram illustrating a configuration of a transmission side of eNB according to Embodiment 1.
  • FIG. 7 is a block diagram illustrating a configuration of RN according to Embodiment 1.
  • FIG. 8 is a block diagram illustrating a configuration of LTE-A UE 2 according to Embodiment 1.
  • FIG. 9 is a diagram for describing operations of RN and LTE-A UE 2 performed using respective subframes of a configuration # 1 in Embodiment 1.
  • FIG. 10 is a schematic diagram illustrating an overall configuration of a conventional wireless relay system.
  • FIG. 11 is a conceptual diagram illustrating a case where a TDD system is applied to relaying of a relay system 30 .
  • FIG. 12 is a diagram for describing an example in which loop interference occurs in a TDD system that performs carrier aggregation.
  • FIG. 1 is a schematic diagram illustrating a configuration of the wireless relay system according to Embodiment 1.
  • the wireless relay system illustrated in FIG. 1 includes: a base station 100 ; a mobile station 200 ; a mobile station 250 ; and a relay station 300 .
  • the relay station 300 is installed between the base station 100 and the mobile station 200 in order to increase a coverage area of the base station 100 , and communication between the base station 100 and the mobile station 200 is performed via the relay station 300 .
  • the mobile station 250 is a terminal subordinate to the base station 100 .
  • TDD time division duplex
  • TD relay time division relay
  • carrier aggregation in which the base station 100 simultaneously provides service of two or more frequency bands (carriers) is performed.
  • carrier aggregation when attention is given to a single frequency band, a system is established by the single frequency band, and therefore, selection is allowed between the use of only a single carrier and the use of a plurality of carriers in accordance with configurations of the mobile stations and requests therefrom.
  • data is relayed through two hops from the base station 100 to the mobile station 200 via the relay station 300 .
  • the mobile station 200 serves as a terminal (UE) adaptable to an LTE-A (Long Term Evolution Advanced) communication system.
  • LTE-A Long Term Evolution Advanced
  • the base station 100 , the mobile station 200 , the mobile station 250 and the relay station 300 will be simply referred to as “eNB”, “LTE-A UE 2 ”, “UE 1 ” and “RN”, respectively.
  • RN is capable of transmitting/receiving data to/from UE 2 in a state where no interruption-induced interference occurs.
  • UL uplink
  • DL downlink
  • FIG. 2 is a diagram for describing the operation example of the wireless relay system according to Embodiment 1.
  • each of eNB, UE 1 , LTE-A UE 2 and RN transmits/receives data via the uplink or downlink using a plurality of subframes # 2 to # 5 .
  • FIG. 1 In each of two frequency bands 1 and 2 (described as Carriers 1 and 2 in FIG. 2 ), each of eNB, UE 1 , LTE-A UE 2 and RN transmits/receives data via the uplink or downlink using a plurality of subframes # 2 to # 5 .
  • the subframes # 2 and # 3 are UL subframes serving as uplink (UL) subframes
  • the subframes # 4 and # 5 are DL subframes serving as downlink (DL) subframes.
  • the subframes # 3 and # 4 in the frequency band 1 are used for communication between RN and eNB for UL and DL, respectively.
  • a signal is transmitted via the uplink (UL) in the direction indicated by the arrow from any one of UE 1 , LTE-A UE 2 and RN, which plays a predominant role in the operation, by using any one of the subframes # 2 to # 5 in the frequency band 1 (Carrier 1 ).
  • RN transmits/receives data to/from eNB by using part of resources allocated to UL and part of resources allocated to DL, and during this period, RN suspends service provided to UE 2 connected to RN.
  • RN transmits a UL signal to eNB. Further, using the subframe # 4 that is DL in terms of configuration, RN receives a DL signal from eNB.
  • RN transmits a DL signal to LTE-A UE 2 . Further, using the subframe # 4 that is DL in terms of configuration, RN receives a UL signal from LTE-A UE 2 .
  • RN transmits a UL signal or a DL signal using the subframe # 3 , and therefore, effective utilization of resources is enabled, thereby preventing occurrence of loop interference. Furthermore, in both of the frequency bands 1 and 2 , RN receives a UL signal or a DL signal using the subframe # 4 , and therefore, effective utilization of resources is enabled, thereby preventing occurrence of loop interference.
  • RN transmits PDCCH serving as a control signal in a head part of the subframe # 4
  • RN transmits the control signal to UE 2 even when the subframe # 4 in the frequency band 2 is used for UL, thus enabling effective utilization of resources and making it possible to prevent occurrence of loop interference in both of the frequency bands 1 and 2 .
  • the timing at which RN communicates with eNB differs from the timing at which RN communicates with UE 2 .
  • RN is incapable of allowing the sharing of a reception circuit and a transmission circuit in the frequency bands 1 and 2 in this situation.
  • FIG. 3 is a diagram illustrating the timings at which data is transmitted/received using the subframes # 3 and # 4 in the wireless relay system according to Embodiment 1. Note that SC-FDMA is used for the reception side of eNB, and OFDM is used for the transmission side of eNB.
  • RN When RN communicates with eNB, the arrival of a signal transmitted from eNB at RN is delayed through DL, and therefore, the reception of the signal, transmitted from eNB, by RN is delayed in accordance with the transmission delay.
  • RN hastens the transmission of a UL signal to eNB so as to be coordinated with the reception timing of eNB.
  • the signal will be transmitted through UL after the end of communication performed via a subframe previous to UL through which a transmission is made from RN to eNB.
  • RN transmits a UL signal at the transmission timing coincident with the reception timing of eNB, but in order to transmit an SC symbol # 0 , RN has to make a transmission at an early time also using the time of another subframe. However, since RN has to receive data using the previous subframe, RN cannot transmit data from the SC symbol # 0 .
  • RN starts to transmit data from an SC symbol # 1 .
  • the SC symbol, from which RN can start the transmission changes depending on a transmission delay amount between RN and eNB.
  • the SC number from which RN can start the transmission is increased in accordance with increase in the transmission delay amount between RN and eNB.
  • RN transmits a signal to UE 2 using the same subframe # 3 in the frequency band 2 (Carrier 2 )
  • RN transmits the signal so that the transmission timing of the frequency band 2 is coordinated with the transmission timing (Timing A in FIG. 3 ) of the frequency band 1 (Carrier 1 ).
  • LTE-A UE 2 receives DL signals from RN in the frequency band 2 at different synchronizing timings between the subframe # 3 and the other subframes.
  • RN notifies LTE-A UE 2 of a change in the transmission timing of the subframe through which a DL signal is transmitted. Then, LTE-A UE 2 , which has received the notification, changes the reception synchronizing timing to receive a DL signal from RN.
  • the timing (Timing A in FIG. 3 ), at which RN starts transmission using the subframe # 3 configured for UL in terms of configuration, is delayed relative to the timing of transmission started using a normal subframe.
  • RN can transmit 14 OFDM symbols by using a normal subframe
  • RN can transmit only 13 OFDM symbols to LTE-A UE 2 by using the subframe # 3 illustrated in FIG. 3 .
  • RN receives a DL signal, transmitted from eNB, by using the subframe # 4 configured for DL in terms of configuration.
  • the arrival of the DL signal at RN from eNB is delayed relative to the timing of the subframe in accordance with the transmission delay.
  • RN transmits first 2 OFDM symbols to LTE-A UE 2 , and therefore, RN is incapable of receiving a DL signal transmitted from eNB in a duration of the 2 symbols.
  • MBSFN subframe means a subframe prepared for implementation of service such as MBMS (Multimedia Broadcast and Multicast Service) in the future. Specifications of an MBSFN subframe are provided so that cell-specific control information is transmitted by first 2 symbols and an MBMS signal is transmitted by a region of the third and subsequent symbols.
  • MBMS Multimedia Broadcast and Multicast Service
  • RN starts to receive data from the OFDM symbol # 3 by using the subframe # 4 .
  • LTE-A UE 2 receives the 2 symbols of the control signal from RN, and then starts to transmit a UL signal from an SC symbol # 3 in consideration of a transmission delay amount between LTE-A UE 2 and RN.
  • RN provides an instruction to LTE-A UE 2 for the timing of the transmission from UE 2 to RN so that the timing of reception of a DL signal from eNB at the reception side of RN in the frequency band 1 and the timing of reception of a UL signal from LTE-A UE 2 in the frequency band 2 are coordinated with each other at “Timing B” in FIG. 3 , for example.
  • LTE-A UE 2 is capable of receiving a signal from RN at the symbol timing different from that in a normal subframe. Moreover, the transmission timings of RN can be coordinated with each other and the reception timings of RN can be coordinated with each other. Accordingly, the reception circuit and transmission circuit of RN are allowed to be shared between the frequency band 1 and frequency band 2 .
  • LTE-A UE 2 transmits a UL signal by using the subframe configured for DL in terms of configuration (which will hereinafter be referred to as a “DL subframe”)
  • LTE-A UE 2 receives a UL signal transmission instruction from RN by using the DL subframe in advance of four or more subframes.
  • the subframe designated by the UL signal transmission instruction is a DL subframe through which a UL signal cannot be normally transmitted
  • LTE-A UE 2 starts the transmission after reception of PDCCH, serving as a control signal, by using the designated subframe.
  • the timing at which the UL signal transmission is started by LTE-A UE 2 is influenced by the length of PDCCH from eNB; thus, when the length of PDCCH is 3 OFDM symbols, the transmission is started from the SC symbol # 3 (fourth symbol) as illustrated in FIG. 3 . When the length of PDCCH is 2 OFDM symbols, the transmission may be started from the SC symbol # 2 . However, when a transmission delay between RN and LTE-A UE 2 is short and the time required for switching between transmission and reception is long, LTE-A UE 2 cannot transmit the UL signal.
  • FIG. 4 provides a flow chart illustrating an example in which UL is allocated to LTE-A UE 2 from RN and LTE-A UE 2 changes transmission timing.
  • RN notifies LTE-A UE 2 of a subframe used for backhaul in advance. In other words, RN changes DL to UL to make a transmission to LTE-A UE 2 . Then, RN provides notification of transmission timing.
  • the notification method may include notification provided using an MBSFN subframe or notification of backhaul position provided by signaling.
  • LTE-A UE 2 moves the procedure to STEP 3 , but when the subframe to which UL is allocated is a subframe that is used for UL at normal times (i.e., in terms of configuration), LTE-A UE 2 moves the procedure to STEP 4 .
  • LTE-A UE 2 changes the transmission timing to the transmission timing for which the notification has been provided in advance, and starts to transmit a signal from the fourth OFDM symbol.
  • a signal may be transmitted from the second OFDM symbol or the third OFDM symbol.
  • LTE-A UE 2 starts to transmit a signal from the first OFDM symbol at the normal transmission timing.
  • FIG. 5 is a block diagram illustrating a configuration of a reception side of the base station 100 according to Embodiment 1
  • FIG. 6 is a block diagram illustrating a configuration of a transmission side of eNB according to Embodiment 1. Note that SC-FDMA is used for the reception side of eNB, and OFDM is used for the transmission side of eNB.
  • eNB illustrated in FIG. 5 includes: a reception antenna 121 ; a wireless receiver 123 ; a DFT section 125 ; a signal separator 127 ; channel estimators/frequency domain equalizers 129 A and 129 B; subcarrier de-mappers 131 A and 131 B; demodulators 133 A and 133 B; IFFT sections 135 A and 135 B; and decoders 137 A and 137 B.
  • the wireless receiver 123 receives a signal from RN via the reception antenna 121 , performs wireless processing such as downconverting on the signal, and outputs the resulting signal to the DFT (Discrete Fourier Transform) section 125 .
  • DFT Discrete Fourier Transform
  • the DFT section 125 performs discrete Fourier transform processing on the signal, inputted from the wireless receiver 123 , so as to convert a time signal into a frequency component, and outputs the resulting signal to the signal separator 127 .
  • the signal separator 127 separates the frequency component of the time signal, inputted from the DFT section 125 , into a signal of the frequency band 1 (which will hereinafter be referred to as a “signal 1 ”) and a signal of the frequency band 2 (which will hereinafter be referred to as a “signal 2 ”). Then, the signal separator 127 outputs the signal 1 to the channel estimator/frequency domain equalizer 129 A, and outputs the signal 2 to the channel estimator/frequency domain equalizer 129 B.
  • the channel estimators/frequency domain equalizers 129 A and 129 B carry out channel estimation and frequency domain equalization on the signals 1 and 2 , respectively, by using a reference signal, and output the resulting signals to the subcarrier de-mappers 131 A and 131 B.
  • the subcarrier de-mappers 131 A and 131 B return signals mapped on subcarriers to original signal sequences, and output the resulting signals to the demodulators 133 A and 133 B.
  • the demodulators 133 A and 133 B demodulate the signals 1 and 2 , respectively, in the respective frequency bands, and output the resulting signals to the IFFT sections 135 A and 135 B.
  • the IFFT sections 135 A and 135 B perform inverse fast Fourier transform processing on the demodulated signals 1 and 2 , respectively, so as to convert frequency axis signals into time axis signals, and output the resulting signals to the decoders 137 A and 137 B.
  • the decoders 137 A and 137 B decode the signals 1 and 2 processed by the IFFT sections 135 A and 135 B, respectively, and output the resulting signals as reception signals.
  • the base station 100 (transmission side) illustrated in FIG. 6 includes: encoders 101 A and 101 B; modulators 103 A and 103 B; subcarrier mappers 105 A and 105 B; a signal selector 107 ; an IFFT section 109 ; a channel allocator 111 ; a wireless transmitter 113 ; a transmission antenna 115 ; an allocation information generator 117 ; and a transmission timing control information generator 119 .
  • the allocation information generator 117 Based on the traffic from eNB to RN, the traffic from eNB to UE, and the traffic from RN to UE, the allocation information generator 117 allocates resources to be used from eNB to RN and resources to be used from RN to LTE-A UE 2 for the frequency bands 1 and 2 , thereby generating allocation information. Then, the allocation information generator 117 outputs the generated allocation information to the encoders 101 A and 101 B, the signal selector 107 and the channel allocator 111 .
  • UE includes both of the mobile stations (UE), i.e. UE 1 subordinate to eNB, and LTE-A UE 2 .
  • the transmission timing control information generator 119 generates transmission timing control information by which an instruction for the UL signal transmission timing is provided for UE 1 and RN subordinate to eNB, and outputs the transmission timing control information to the channel allocator 111 .
  • the encoders 101 A and 101 B Based on the allocation information generated by the allocation information generator 117 , the encoders 101 A and 101 B adjust, in accordance with an OFDM symbol range, the number of symbols to be encoded, encode transmission signals to be transmitted to RN and UE, and output the resulting signals to the modulators 103 A and 103 B.
  • the modulators 103 A and 103 B modulate the encoded transmission signals to be transmitted to RN and UE, and output the resulting signals to the subcarrier mappers 105 A and 105 B.
  • the subcarrier mappers 105 A and 105 B map the modulated transmission signals on subcarriers, and output the resulting signals to the signal selector 107 .
  • the signal selector 107 selects a signal intended for RN and a signal intended for UE from the signals processed by the subcarrier mappers 105 A and 105 B, and outputs the selected signals to the IFFT section 109 .
  • the IFFT section 109 performs inverse fast Fourier transform processing on the signals, selected by the signal selector 107 , so as to convert frequency axis signals into time axis signals, and outputs the resulting signals to the channel allocator 111 .
  • the channel allocator 111 allocates the allocation information, generated by the allocation information generator 117 , and the transmission signals to a channel, and outputs the resulting signals to the wireless transmitter 113 .
  • the wireless transmitter 113 performs wireless processing such as upconverting on the modulated signals, and outputs the resulting signals to RN and UE via the transmission antenna 115 .
  • FIG. 7 is a block diagram illustrating the configuration of the relay station (RN) 300 according to Embodiment 1. RN illustrated in FIG. 7
  • a reception antenna 301 includes: a reception antenna 301 ; a wireless receiver 303 ; a DFT section 305 ; a signal separator 307 ; channel estimators/frequency domain equalizers 309 A and 309 B; subcarrier de-mappers 311 A and 311 B; demodulators 313 A and 313 B; an IFFT section 315 ; decoders 317 A and 317 B; encoders 319 A and 319 B; a DFT section 321 ; modulators 323 A and 323 B; subcarrier mappers 325 A and 325 B; a signal selector 327 ; an IFFT section 329 ; a channel allocator 331 ; a wireless transmitter 335 ; a transmission antenna 337 ; a timing controller 339 ; an allocation information receiver 341 ; and a transmission/reception timing control information generator 343 .
  • the wireless receiver 303 receives signals from LTE-A UE 2 and eNB via the reception antenna 301 , performs wireless processing such as downconverting on the signals, and outputs the resulting signals to the DFT (Discrete Fourier Transform) section 305 .
  • DFT Discrete Fourier Transform
  • the DFT section 305 performs discrete Fourier transform processing on each of the signals, inputted from the wireless receiver 303 , so as to convert a time signal into a frequency component, and outputs the resulting signal to the signal separator 307 .
  • the signal separator 307 separates each signal processed by the DFT section 305 into: a signal including allocation information; a signal including transmission timing control information; a relay signal provided from eNB; and a relay signal provided from LTE-A UE 2 .
  • the signal separator 307 outputs the signal including the allocation information to the allocation information receiver 341 , and outputs the signal including the transmission timing control information to the timing controller 339 .
  • the signal separator 307 outputs the relay signal provided from eNB and the relay signal provided from LTE-A UE 2 to the channel estimators/frequency domain equalizers 309 A and 309 B, respectively.
  • the allocation information separated by the signal separator 307 includes, for each frequency band, subframe allocation information for a subframe to be used for communication between RN and eNB and a subframe to be used for communication between RN and LTE-A UE 2
  • the relay signal which is a DL OFDM signal provided from eNB and separated by the signal separator 307 , is processed by the channel estimator/frequency domain equalizer 309 A, the subcarrier de-mapper 311 A, the demodulator 313 A, the decoder 317 A, the encoder 319 A, the modulator 323 A, and the subcarrier mapper 325 A in this order, and is then outputted to the signal selector 327 .
  • the relay signal which is a UL SC signal provided from LTE-A UE 2 and separated by the signal separator 307 , is appropriately processed by the channel estimator/frequency domain equalizer 309 B, the subcarrier de-mapper 311 B, the demodulator 313 B, the IFFT section 315 , the decoder 317 B, the encoder 319 B, the DFT section 321 , the modulator 323 B, and the subcarrier mapper 325 B in this order, and is then outputted to the signal selector 327 .
  • the signal selector 327 selects the UL SC signal to be relayed to eNB or the DL OFDM signal to be relayed to LTE-A UE 2 , and outputs the selected signal to the IFFT section 329 .
  • the timing controller 339 uses the transmission timing control information inputted from the signal separator 307 to generate a transmission timing control signal for controlling transmission timing, and outputs the transmission timing control signal to the transmission/reception timing control information generator 343 and the wireless transmitter 335 .
  • the transmission/reception timing control information generator 343 For LTE-A UE 2 subordinate to RN, the transmission/reception timing control information generator 343 generates a transmission/reception timing signal which is intended for LTE-A UE 2 and by which an instruction for the transmission timing of the UL SC signal and the reception timing of the DL OFDM signal is provided. Further, the transmission/reception timing control information generator 343 outputs the transmission/reception timing signal, intended for LTE-A UE 2 , to the channel allocator 331 .
  • There are provided two types of transmission timing i.e., timing for transmission via a normal subframe and timing for transmission of the UL SC signal via a DL subframe.
  • reception timing i.e., timing for reception of the DL OFDM signal via a UL subframe.
  • the allocation information receiver 341 outputs, to the signal selector 327 and the channel allocator 331 , the subframe allocation information included in the allocation information outputted from the signal separator 307 .
  • the IFFT section 329 performs inverse fast Fourier transform processing on the signal, selected by the signal selector 327 , so as to convert a frequency axis signal into a time axis signal, and outputs the resulting signal to the channel allocator 331 .
  • the channel allocator 331 Based on the subframe allocation information for each subframe, inputted from the allocation information receiver 341 , the channel allocator 331 outputs, to the wireless transmitter 335 , the relay signal inputted from the IFFT section 329 and to be relayed to eNB or the relay signal inputted from the IFFT section 329 and to be relayed to LTE-A UE 2 . Furthermore, the channel allocator 331 outputs, to the wireless transmitter 335 , the transmission/reception timing signal outputted from the transmission/reception timing control information generator 343 and intended for LTE-A UE 2 .
  • the wireless transmitter 335 performs wireless processing such as upconverting on the transmission/reception timing signal intended for LTE-A UE 2 or each relay signal which has been outputted from the channel allocator 331 , and transmits the resulting signal to eNB or LTE-A UE 2 via the transmission antenna 337 .
  • FIG. 8 is a block diagram illustrating the configuration of the mobile station 200 according to Embodiment 1.
  • the mobile station 200 illustrated in FIG. 8 is a block diagram illustrating the configuration of the mobile station 200 according to Embodiment 1.
  • the mobile station 200 illustrated in FIG. 8 is a block diagram illustrating the configuration of the mobile station 200 according to Embodiment 1.
  • a reception antenna 201 includes: a reception antenna 201 ; a wireless receiver 203 ; a DFT section 205 ; a signal separator 207 ; a channel estimator/frequency domain equalizer 209 ; a subcarrier de-mapper 211 ; a demodulator 213 ; a decoder 215 ; a timing information receiver 217 ; an allocation information receiver 219 ; an encoder 221 ; a DFT section 223 ; a modulator 225 ; a subcarrier mapper 227 ; an IFFT section 229 ; a channel allocator 231 ; a wireless transmitter 233 ; and a transmission antenna 235 . Description of parts common to those described with reference to the block diagrams of eNB illustrated in FIGS. 5 and 6 will be omitted.
  • the wireless receiver 203 receives, via the reception antenna 201 , a signal provided from eNB or a signal provided from RN in accordance with a reception timing signal outputted from the timing information receiver 217 and intended for LTE-A UE 2 . Then, the wireless receiver 203 performs wireless processing such as downconverting on each signal, and outputs the resulting signal to the DFT (Discrete Fourier Transform) section 205 .
  • DFT Discrete Fourier Transform
  • the DFT section 205 performs discrete Fourier transform processing on the signal, inputted from the wireless receiver 203 , so as to convert a time signal into a frequency component, and outputs the resulting signal to the signal separator 207 .
  • the signal separator 207 separates the frequency component of the time signal, inputted from the DFT section 205 , into a signal of the frequency band 1 (which will hereinafter be referred to as a “signal 1 ”) and a signal of the frequency band 2 (which will hereinafter be referred to as a “signal 2 ”).
  • the channel estimator/frequency domain equalizer 209 carries out channel estimation and frequency domain equalization on the signals 1 and 2 by using a reference signal, and outputs the resulting signals to the subcarrier de-mapper 211 .
  • the subcarrier de-mapper 211 restores signals mapped on subcarriers to original signal sequences, and outputs the resulting signals to the demodulator 213 .
  • the demodulator 213 demodulates the signals 1 and 2 separated into the signal provided from RN and the signal provided from eNB for the respective frequency bands, and outputs the resulting signals to the decoder 215 .
  • the decoder 215 decodes each of the demodulated signals, and outputs the reception signals received from RN and eNB.
  • the timing information receiver 217 extracts transmission/reception timing information from a transmission/reception timing signal received from RN and intended for LTE-A UE 2 , and outputs the timing information to the wireless transmitter 233 or the wireless receiver 203 .
  • the timing information receiver 217 controls transmission timing and reception timing.
  • the allocation information receiver 219 receives allocation information relayed by RN, and outputs the information to the encoder 221 and the channel allocator 231 .
  • the encoder 221 Based on the allocation information received by the allocation information receiver 219 , the encoder 221 adjusts, in accordance with an OFDM symbol range, the number of symbols to be encoded, encodes transmission signals to be transmitted to RN and eNB, and outputs the resulting signals to the DFT section 223 .
  • a signal for a subframe by which switching between UL and DL is performed is encoded by the encoder 221 in accordance with the number of bits appropriate to the number of usable OFDM symbols.
  • the DFT section 223 performs discrete Fourier transform processing on each signal, outputted from the encoder 221 , so as to convert a time signal into a frequency component, and outputs the resulting signal to the modulator 225 .
  • the modulator 225 modulates the encoded transmission signals to be transmitted to RN and eNB, and outputs the resulting signals to the subcarrier mapper 227 .
  • the subcarrier mapper 227 maps each of the modulated transmission signals on a subcarrier, and outputs the resulting signal to the IFFT section 229 .
  • the IFFT section 229 performs inverse fast Fourier transform processing on each of the transmission signals, mapped on a subcarrier, so as to convert a frequency axis signal into a time axis signal, and outputs the resulting signal to the channel allocator 231 .
  • the channel allocator 231 allocates, to a channel, the allocation information received by the allocation information receiver 219 and each transmission signal, and outputs the resulting signal to the wireless transmitter 233 .
  • the wireless transmitter 233 performs wireless processing such as upconverting on the modulated signals. Then, based on the transmission timing signal outputted from the timing information receiver 217 and intended for LTE-A UE 2 , the wireless transmitter 233 transmits the signals to RN and eNB via the transmission antenna 235 .
  • the wireless relay system according to Embodiment 1 includes a subframe used for communication between RN and eNB and a subframe used between RN and LTE-A UE 2
  • LTE-A UE 2 which is subordinate to RN and has been simultaneously receiving service of two frequency bands at normal times, is given service of a single frequency band for only a subframe in which switching occurs.
  • FIG. 9 is a diagram for describing operations of RN and LTE-A UE 2 performed using respective subframes of the configuration # 1 in Embodiment 1.
  • the row of Subframe # indicates subframe numbers.
  • the row of Configuration # 1 indicates which of the downlink (DL) and uplink (UL) is configured for each subframe of Configuration # 1 in terms of configuration. Further, in FIG. 9
  • the rows of Carrier 1 and Carrier 2 each indicate for which link each subframe is actually used.
  • a symbol “S” in FIG. 9 represents a special subframe.
  • the special subframe serves as a subframe inserted into a subframe in which DL is switched to UL.
  • the special subframe includes a guard period, thus allowing a transmission delay to be absorbed in the guard period.
  • the subframes # 3 and # 4 are backhaul links used for communication between RN and eNB.
  • RN transmits a DL subframe to LTE-A UE 2 by using the subframe # 3 serving as a UL subframe in terms of configuration.
  • RN receives a UL subframe from LTE-A UE 2 by using the subframe # 4 serving as a DL subframe in terms of configuration.
  • the subframes # 3 and # 4 each provide service of only the single frequency band.
  • RN transmits ACK/NACK and allocation signals for the frequency bands 1 and 2 to LTE-A UE 2 subordinate to RN.
  • ACK/NACK is transmitted after four or more subframes from data transmission.
  • ACK/NACK responsive to UL signals (regions surrounded by the broken lines in FIG. 9 ) transmitted using the subframes # 7 and # 8 preceding the subframe # 3 by four or more subframes is transmitted to LTE-A UE 2 by RN. Accordingly, ACK/NACK for the subframes # 7 and # 8 has been scheduled to be transmitted using the subframe # 4 but can be transmitted one subframe earlier.
  • ACK/NACK for DL signals (regions surrounded by the chain double-dashed lines in FIG. 9 ) transmitted using the subframes # 9 and # 0 in the frequency bands 1 and 2 is transmitted to RN by LTE-A UE 2 .
  • ACK/NACK which has to be transmitted using the subframe # 7 , can be transmitted using the subframe # 4 , thereby making it possible to reduce a retransmission delay.
  • LTE-A UE 2 is capable of transmitting/receiving ACK/NACK to/from RN also by using the subframe by which communication between RN and eNB is performed, thereby obtaining an advantage that a retransmission delay is reduced for both of the two frequency bands.
  • a control signal such as a CQI report, a measurement report or the like for the two frequency bands may be transmitted via UL.
  • a control signal such as a CQI report, a measurement report or the like for the two frequency bands may be transmitted via UL.
  • resource allocation information for the two frequency bands may be transmitted.
  • ACK/NACK for both of the frequency bands may be transmitted using a PHICH region; alternatively, only ACK/NACK for the frequency (Carrier 2 in this example) by which DL transmission is enabled may be transmitted using PHICH, and ACK/NACK for the other frequency may be transmitted using a data region.
  • ACK/NACK for a plurality of frequency bands is transmitted via UL like the subframe # 4 which is also illustrated by way of example, different ACK/NACK may be transmitted for each frequency band; alternatively, single ACK/NACK may be transmitted so that ACK is transmitted when ACK is provided for both of the frequency bands and NACK is transmitted in other cases. Further, only ACK/NACK for the frequency (Carrier 2 in this example) by which UL transmission is enabled may be transmitted using a PUCCH region, and ACK/NACK for the other frequency band may be transmitted using a data region. Furthermore, when UL data transmission is to be performed, a data signal may be punctured to perform transmission using a data region.
  • An antenna port means a logical antenna formed by a single or a plurality of physical antennas.
  • an antenna port does not necessarily mean a single physical antenna, but may mean an array antenna or the like formed by a plurality of antennas.
  • the number of physical antennas by which an antenna port is formed is not specified, but an antenna port is specified as a minimum unit that allows a base station to transmit different reference signals.
  • an antenna port may be specified as a minimum unit by which a precoding vector weight is multiplied.
  • each functional block used in the description of the foregoing embodiment is typically implemented as an LSI that is an integrated circuit.
  • the functional blocks may be individually implemented on a single chip, or may be partially or entirely implemented on a single chip.
  • each functional block is implemented as an LSI, which may also be referred to as “IC”, “system LSI”, “super LSI” or “ultra LSI” depending on a difference in packing density.
  • a method for implementing an integrated circuit is not limited to LSI, but an integrated circuit may be implemented by a dedicated circuit or a general-purpose processor.
  • An FPGA Field Programmable Gate Array
  • An FPGA Field Programmable Gate Array which is programmable or a reconfigurable processor in which connection and setting of a circuit cell inside an LSI are reconfigurable may be utilized after LSI fabrication.
  • a wireless communication relay station apparatus, a wireless communication apparatus, a wireless communication relay method and a wireless communication method according to the present invention have the effect of enabling effective resource utilization and prevention of loop interference, and thus serve as useful wireless communication relay station apparatus, wireless communication apparatus, wireless communication relay method and wireless communication method.

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